The Mot Q9 and the BlackJack 2 are pretty close head to head but as for as which device is better then it would have to depend on what you want in a device. The BlackJack 2 is slim and better looking and has a longer battery life without having to use an extended life battery. Performance wise I would have to give it to the Q9, also the Q9 uses standard data and headphone cables.
Both are great choices, but the BlackJack is cheaper.
If you want a side by side comparison then check out phonescoop.com
Hope this helps.